中文

Cremona 群中小单群的共轭类

代数几何 2022-07-22 v2

摘要

我们考虑了可数多个定义在P1\mathbb{P}^1上的三维PSL2(F7)\mathtt{PSL}_2(\mathbb{F}_7)-del Pezzo 曲面纤维化。据猜想,除了两个族之外,它们都是非理性的,其中一个族是 del Pezzo 曲面与P1\mathbb{P}^1的直积。我们证明了另一个模型在PSL2(F7)\mathtt{PSL}_2(\mathbb{F}_7)-等变意义下双有理等价于P2×P1\mathbb{P}^2\times\mathbb{P}^1。基于 Prokhorov 的一项结果,我们证明了它们作为 Cremona 群Cr3(C)\mathtt{Cr}_3(\mathbb{C})的子群是不共轭的。

关键词

引用

@article{arxiv.1310.5548,
  title  = {On conjugacy classes of the Klein simple group in Cremona group},
  author = {Hamid Abban},
  journal= {arXiv preprint arXiv:1310.5548},
  year   = {2022}
}

备注

The results and content of the older version has been sharpened. Some parts have been published separately, and this is an update for section 3 in V1. Final version, to appear in Glasgow Math Journal